As the name suggests what is BMW's most succesful engine they have ever made? I know there is alot of hype about the N54 and it has won numerous awards but is there any other succesful engine that BMW is renowned for?

hard to complain about the I6's the same basic design goes back many versions, I would group them all together

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You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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1974 2002, 1987 325ic, 1987 325is
1995 M3, 2001 X5, 2007 MCS R56